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Re: [netconf] Question on restconf empty list reply

Schönwälder, Jürgen <J.Schoenwaelder@jacobs-university.de> Sun, 23 February 2020 11:28 UTC

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From: "Schönwälder, Jürgen" <J.Schoenwaelder@jacobs-university.de>
To: Olof Hagsand <olof@hagsand.se>
CC: "netconf@ietf.org" <netconf@ietf.org>
Thread-Topic: [netconf] Question on restconf empty list reply
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Date: Sun, 23 Feb 2020 11:28:30 +0000
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Reply-To: "Schönwälder, Jürgen" <J.Schoenwaelder@jacobs-university.de>
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Subject: Re: [netconf] Question on restconf empty list reply
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My reading of RFC 7951 section 5.4 is that an empty list results in an
empty JSON array. A related question is likely whether the empty list
exists or not. RFC 8040 says a 404 response indicates that the
resource does not exist (or is not accessible). So both responses may
be reasonable, depending on the existence/accessibility of the resource.

/js

On Sun, Feb 23, 2020 at 12:12:58PM +0100, Olof Hagsand wrote:
> Hello,
> In a restconf GET request of an empty YANG list using JSON encoding,
> what is the expected reply? I.e. using a yang list "x" in module "m"
> (pseudo http):
>   GET /restconf/data/m:x
>   Accept: application/yang-data+json
> 
> Is the reply (1):
>   HTTP/1.1 200 OK
>   {
>     "m:x": []
>   }
> 
> or should it be (2)
>   "404 Not Found" status-line and error-tag value "invalid-value"?
> 
> Apologizes that this is a basic question, and I am sure this is resolved
> properly, but we have some discussions with users on how to properly
> interpret the description of GET in RFC 8040 Section 4.3 and RFC 7951.
> 
> Regards,
> Olof Hagsand,
> Clixon maintainer
> 
> _______________________________________________
> netconf mailing list
> netconf@ietf.org
> https://www.ietf.org/mailman/listinfo/netconf

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>

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